http://www.youtube.com/watch?v=xXHY6zWW52sThis amazes me.
If you've ever heard of Vocaloid, you'll understand this slightly.
It's a video of a Cell-Shaded 3D Miku Hatsune. Completely fanmade. It's really good, the music is from/made in Vocaloid 2. Sung by Miku Hatsune, the voice synth.
Edit:
http://www.youtube.com/watch?v=XS6oeCFZLYAMore wow. The song in this one is one of the sample music that they have on the webstie.
http://www.youtube.com/watch?v=OFY25-q9dwIRemix of the above.
Miku Miku ni Shite Ageru~
http://youtube.com/watch?v=V89h2Yb3TC8To further demonstrate the capabilities, Miku Astley!
http://youtube.com/watch?v=J_tBou4juBsAll sung by Vocaloid 2: Miku Hatsune